christogenea.org
The Revelation of Yahshua Christ opens thus: "A revelation from Yahshua Christ which God had given to Him to show to His servants the things which are necessary to happen quickly, and He having sent explained through His messenger to His servant Iohannes, who bore witness to the Word of God and the testimony of Yahshua Christ, as many things as he had seen. "
It is clear from John 1:1 that John believed Yahshua Christ to be God come in the flesh. Where the Revelation testifies that it is written by "His servant Iohannes, who bore witness to the Word of God" that can only mean that this John who wrote the Revelation is the same John who wrote the Gospel, the "Word of God" mentioned here.